An act of putting your nuts in somebodys ass while you have sex with them. In homosexual intercourse it would be having your full penis and nuts inside the anal cavity.
Ex 1 - Mark was "stuffin" adam last night behind the muffler shop

Ex 2 - Glen was stuffin his women last night
by el.harp March 7, 2007
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Hardcore slammin sex with a girl you barely know, followed by a fist gyration which resembles the banging in of a railroad tie, but sideways.
Damn! Did you hear Bill giving Miley stuffins (insert hand gesture here) last night? Woke everyone in the house up!
by Curits House July 24, 2009
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1. This refers to the arrest, handcuffing, and placement of an individual into a police cruiser. The term is used when the individual in question is obviously a waste of skin and oxygen.

2. This can also refer to holding people responsible for their own actions, and punishing them accordingly.
1. The police officers were cuffin' and stuffin' the gliberal (Yes, gliberal) "peace activists."

2. John Smith kept disrupting the education of his peers, so the teacher found himself cuffin' and stuffin' John all the way down to the main office. It should be noted that John Smith simply received a pathetic slap on the wrist, along with a Band-Aid for his bruised ego and self-esteem. He soon found himself back in class, wasting everyone else's time, and the taxpayers' money. This also encouraged several of his peers to display a contempt and disrespect for authority.
by crash December 5, 2003
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sticking your dick in wrong girl (i.e. cheating)
Girlfriend: So he got a room with his "friend" for a night and claims nothing happened.

Friend: OH hes definately stuffin the canoli
by littleguy6 April 28, 2009
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